Online shopping

Hi, I had done online shopping from a website which is based in UK. They have sent the parcel and its held at custom office. They have sent below notice to be signed post which they will release by parcel. Is it ok to sign this notice or are than any risk involved? What if i dont sign this notice and share Request your help. thanks Waiver of the Show Cause Notice Declaration and undertaking for release of goods/post parcels To, Asstt. / Dy. Commissioner of Customs, Airport Parcel Sorting Office, Sahar, Vile Parle (East), Mumbai 400099. Sir, Sub : Declaration and undertaking for release of EMS Post Parcel with Tracking No. BY No reg :---------- *********** The duty, penalty & fine have been communicated by E mail /orally to me in respect of goods imported vide above Tracking No & BY No. I agree to pay the duty, penalty & fine imposed by the Customs officer. I declare that the goods imported by me/us are not prohibited /restricted / contraband as per import/export policies and other Acts/law enforced for the time being. If in the future, the department finds out that we/I have contravened any of the provisions of the Customs Act, 1962 as well as other Acts/law enforced for the time being, I/We will be held responsible for all such lapses and liable for legal action /punishment/penalty/fine etc. I state that the value declared by me/us for the above mentioned parcel is true and correct as per the documents submitted by me and if the department finds it false or incorrect. I /We will be held responsible for any legal action. I also undertake to pay any differential duty which arises on account of mis-declaration of value along with Fine/Penalty etc. As I was not aware about the procedure and rules regulation of Customs Act & other Acts in force and this is my first mistake. I request to take a lenient view in the matter for imposing penalty and fine and pass the order without issue of written show cause notice. I do not wish to be heard in person by the adjudicating authority. Thanking you.